1. Disconnecting the Battery: This is the simplest method and often clears many issues.
* Procedure: Disconnect the negative (-) battery terminal first. Wait at least 30 minutes (some recommend up to an hour or even overnight) before reconnecting it. Reconnect the negative terminal first, then the positive (+).
* What it resets: Many learned parameters (like idle air control, shift points, etc.) are reset. Trouble codes stored in short-term memory may also be cleared, but longer-term codes stored in the ECM's memory will likely remain.
2. Using a Scan Tool: This is the most thorough method.
* Procedure: A scan tool (OBD-II code reader) can be purchased relatively inexpensively. Connect it to the OBD-II port (usually located under the dashboard). The tool will allow you to read and clear trouble codes. Some higher-end scanners can also reset learned parameters.
* What it resets: Trouble codes and may offer options to reset various learned parameters depending on the scan tool's capabilities.
3. Specific System Resets (May Require Professional Help): Some systems might have specific reset procedures, but these aren't generally accessible without specialized tools or knowledge.
Important Considerations:
* Why are you resetting it? If you're experiencing a specific problem, simply resetting the computer might not fix it. Diagnose the problem first. A reset is often a troubleshooting step, not a solution.
* Check Engine Light: If the check engine light is on, you should have the trouble codes diagnosed before resetting anything. The codes provide valuable information about the problem. Ignoring them could lead to further damage.
In short: Disconnecting the battery is the easiest method for a basic reset. However, for a more thorough diagnosis and reset, using a scan tool is highly recommended. If you're unsure about any of these steps, it's best to consult a qualified mechanic.
